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Abstract

Pupil filters for cylindrical (two-dimensional) focusing with extended depth of field are
investigated. An important application is in generating light sheets with uniform intensity.
Filters for spherical (three-dimensional) focusing with a flat axial intensity, coupled with
weak side lobes are also discussed.

Figures (3)

The variation of the Strehl ratio S with transverse gain
GTfor different filters. The maximally flat filters 3a, 5a, 7a lie
on the dashed line indicated. The maximally flat filters 3b, 5b, 7d lie on another dashed
line. The behavior for general symmetrical 3 element binary phase filters is also shown as
solid lines: there are two branches, shown in red for GT≥1 and in greenGT≤1.